SIST EN ISO 12625-16:2015
(Main)Tissue paper and tissue products - Part 16: Determination of optical properties - Opacity (paper backing) - Diffuse reflectance method (ISO 12625-16:2015)
Tissue paper and tissue products - Part 16: Determination of optical properties - Opacity (paper backing) - Diffuse reflectance method (ISO 12625-16:2015)
This part of ISO 12625 specifies testing procedures for the instrumental determination of opacity paper backing of
tissue paper and tissue products by diffuse reflectance.
This part of ISO 12625 also gives specific instructions for the preparation of test pieces (single-ply, multi-ply products),
where special precautions may be necessary.
It can be used to determine the opacity of tissue paper and tissue products which contain fluorescent whitening agents,
provided the UV content of the radiation incident on the test piece has been adjusted to conform to that in the CIE
illuminant C using a fluorescent reference standard provided by an ISO/TC 6 authorized laboratory as described in ISO 2470-1.
This International Standard is not applicable to coloured tissue paper and tissue products which incorporate fluorescent
dyes or pigments.
Tissue-Papier und Tissue-Produkte - Teil 16: Bestimmung der optischen Eigenschaften - Opazität über Papierstapel - Diffuser Reflexionsfaktor (ISO 12625-16:2015)
Papier tissue et produits tissues - Partie 16: Détermination des propriétés optiques - Opacité sur fond papier - Méthode par réflexion en lumière diffuse (ISO 12625-16:2015)
L'ISO 12625-16:2015 spécifie les procédures d'essai pour la détermination instrumentale de l'opacité des papiers tissue ou des produits tissue, par réflexion en lumière diffuse, en utilisant un fond papier.
Elle contient également des instructions spécifiques pour la préparation des éprouvettes des produits à pli unique et produits multiplis, lorsque des préparations/procédures spécifiques peuvent se révéler nécessaires.
Elle peut être utilisée pour déterminer l'opacité de papiers tissue ou de produits tissue contenant des agents d'azurage fluorescents, à condition que la teneur en UV du rayonnement incident sur l'éprouvette ait été ajustée pour être rendue conforme à celle de l'illuminant C de la CIE, à l'aide d'un étalon de référence fluorescent fourni par un laboratoire agréé, tel que décrit dans l'ISO 2470-1.
L'ISO 12625-16:2015 ne s'applique pas aux papiers tissue et produits tissue colorés, comprenant des colorants ou des pigments fluorescents.
Tissue papir in proizvodi iz tissue papirja - 16. del: Ugotavljanje optičnih lastnosti - Opaciteta (papirna podlaga) - Metoda razpršene odsevnosti (ISO 12625-16:2015)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 12625-16:2015
01-junij-2015
7LVVXHSDSLULQSURL]YRGLL]WLVVXHSDSLUMDGHO 8JRWDYOMDQMHRSWLþQLKODVWQRVWL
2SDFLWHWD SDSLUQDSRGODJD 0HWRGDUD]SUãHQHRGVHYQRVWL ,62
Tissue paper and tissue products - Part 16: Determination of optical properties - Opacity
(paper backing) - Diffuse reflectance method (ISO 12625-16:2015)
Tissue-Papier und Tissue-Produkte - Teil 16: Bestimmung der optischen Eigenschaften -
Opazität über Papierstapel - Diffuser Reflexionsfaktor (ISO 12625-16:2015)
Papier tissue et produits tissues - Partie 16: Détermination des propriétés optiques -
Opacité sur fond papier - Méthode par réflexion en lumière diffuse (ISO 12625-16:2015)
Ta slovenski standard je istoveten z: EN ISO 12625-16:2015
ICS:
85.080.20 Tissue papir Tissue paper
SIST EN ISO 12625-16:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN ISO 12625-16:2015
---------------------- Page: 2 ----------------------
SIST EN ISO 12625-16:2015
EUROPEAN STANDARD
EN ISO 12625-16
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2015
ICS 85.060
English Version
Tissue paper and tissue products - Part 16: Determination of
optical properties - Opacity (paper backing) - Diffuse reflectance
method (ISO 12625-16:2015)
Papier tissue et produits tissue - Partie 16: Détermination Tissue-Papier und Tissue-Produkte - Teil 16: Bestimmung
des propriétés optiques - Opacité sur fond papier - Méthode der optischen Eigenschaften - Opazität über Papierstapel -
par réflexion en lumière diffuse (ISO 12625-16:2015) Diffuser Reflexionsfaktor (ISO 12625-16:2015)
This European Standard was approved by CEN on 3 January 2015.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12625-16:2015 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 12625-16:2015
EN ISO 12625-16:2015 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 12625-16:2015
EN ISO 12625-16:2015 (E)
Foreword
This document (EN ISO 12625-16:2015) has been prepared by Technical Committee ISO/TC 6 “Paper, board
and pulps” in collaboration with Technical Committee CEN/TC 172 “Pulp, paper and board” the secretariat of
which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by August 2015, and conflicting national standards shall be withdrawn at
the latest by August 2015.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 12625-16:2015 has been approved by CEN as EN ISO 12625-16:2015 without any
modification.
3
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SIST EN ISO 12625-16:2015
---------------------- Page: 6 ----------------------
SIST EN ISO 12625-16:2015
INTERNATIONAL ISO
STANDARD 12625-16
First edition
2015-02-15
Tissue paper and tissue products —
Part 16:
Determination of optical properties
— Opacity (paper backing) — Diffuse
reflectance method
Papier tissue et produits tissue —
Partie 16: Détermination des propriétés optiques — Opacité sur fond
papier — Méthode par réflexion en lumière diffuse
Reference number
ISO 12625-16:2015(E)
©
ISO 2015
---------------------- Page: 7 ----------------------
SIST EN ISO 12625-16:2015
ISO 12625-16:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2015 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 12625-16:2015
ISO 12625-16:2015(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Reflectometer . 2
5.2 Reference standards . 3
5.3 Working standards . 3
5.4 Black cavity . 3
6 Sampling . 3
7 Conditioning . 3
8 Preparation of test pieces . 4
9 Procedure. 4
10 Calculation . 5
11 Test report . 5
Annex A (normative) Spectral characteristics of reflectometers for measuring luminous factor .6
Annex B (informative) Precision . 8
Bibliography .10
© ISO 2015 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 12625-16:2015
ISO 12625-16:2015(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
ISO 12625-16 was prepared by European Committee for Standardization (CEN) Technical Committee
CEN/TC 172 Pulp, paper and board, in collaboration with Technical Committee ISO/TC 6, Paper, board
and pulps, Subcommittee SC 2, Test methods for quality specifications for paper and board, in accordance
with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
ISO 12625 consists of the following parts, under the general title Tissue paper and tissue products:
— Part 1: General guidance on terms
— Part 3: Determination of thickness, bulking thickness and apparent bulk density and bulk
— Part 4: Determination of tensile strength, stretch at break and tensile energy absorption
— Part 5: Determination of wet tensile strength
— Part 6: Determination of grammage
— Part 7: Determination of optical properties — Measurement of brightness and colour with D65/10°
(outdoor daylight)
— Part 8: Water-absorption time and water-absorption capacity, basket-immersion test method
— Part 9: Determination of ball burst strength
— Part 11: Determination of wet ball burst strength
— Part 12: Determination of tensile strength of perforated lines — Calculation of perforation efficiency
— Part 15: Determination of optical properties — Measurement of brightness and colour with C/2°
(indoor daylight)
— Part 16: Determination of optical properties — Opacity (paper backing) — Diffuse reflectance method
iv © ISO 2015 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 12625-16:2015
ISO 12625-16:2015(E)
Introduction
Optical measurements are affected by the geometry of the instruments used and by the texture of the
material. The design of the instrument to be used according to this part of ISO 12625, and the routine to
be adopted for its calibration are specified in ISO 2469.
The optical properties are related to the visual appearance of the material. Although optical properties
are intrinsic properties of tissue paper, they are not functional properties.
The opacity value depends on the principle used for its evaluation, and a method is to be chosen which
most closely relates to the interpretation to be placed upon the results. The method described in this
part of ISO 12625 is applicable when it is desired to measure that property of a tissue paper or tissue
product which governs the extent to which one sheet visually obscures print on underlying sheets. It
is not be confused with methods based on the reduction in a standard contrast by interposition of the
paper opacity (white backing), formerly known as contrast ratio, nor with the assessment of the amount
and condition of light penetrating a sheet (transparency or translucency).
The calculation of opacity requires luminance-factor data obtained by measurement under specified
conditions. The luminance factor depends on the conditions of measurement, and particularly on
the spectral and geometric characteristics of the instrument used for its determination. This part of
ISO 12625 is to be read in conjunction with ISO 2469.
© ISO 2015 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 12625-16:2015
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SIST EN ISO 12625-16:2015
INTERNATIONAL STANDARD ISO 12625-16:2015(E)
Tissue paper and tissue products —
Part 16:
Determination of optical properties — Opacity (paper
backing) — Diffuse reflectance method
1 Scope
This part of ISO 12625 specifies the testing procedures for the instrumental determination of the opacity
of tissue paper or tissue products by diffuse reflectance using a paper backing.
This part of ISO 12625 contains specific instructions for the preparation of test pieces of single-ply and
multi-ply products, where special preparation/procedures might be necessary.
It can be used to determine the opacity of tissue paper and tissue products containing fluorescent
whitening agents, provided the UV content of the radiation incident on the test piece has been adjusted to
conform to that in the CIE illuminant C using a fluorescent reference standard provided by an authorized
laboratory as described in ISO 2470-1.
This part of ISO 12625 is not applicable to coloured tissue paper and tissue products which incorporate
fluorescent dyes or pigments.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (inc
...
SLOVENSKI STANDARD
oSIST prEN ISO 12625-16:2013
01-december-2013
7LVVXHSDSLULQSURL]YRGLL]WLVVXHSDSLUMDGHO 'RORþHYDQMHRSWLþQLKODVWQRVWL
2SDFLWHWD SDSLUQDSRGODJD 0HWRGDUD]SUãHQHRGVHYQRVWL ,62',6
Tissue paper and tissue products - Part 16: Determination of optical properties - Opacity
(paper backing) - Diffuse reflectance method (ISO/DIS 12625-16:2013)
Tissue-Papier und Tissue-Produkte - Teil 16: Bestimmung der optischen Eigenschaften -
Opazität über Papierstapel - Diffuser Reflexionsfaktor (ISO/DIS 12625-16:2013)
Papier tissue et produits tissues - Partie 16: Détermination des propriétés optiques -
Opacité sur fond papier - Méthode par réflexion en lumière diffuse (ISO/DIS 12625-
16:2013)
Ta slovenski standard je istoveten z: prEN ISO 12625-16
ICS:
85.080.20 Tissue papir Tissue paper
oSIST prEN ISO 12625-16:2013 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 12625-16:2013
---------------------- Page: 2 ----------------------
oSIST prEN ISO 12625-16:2013
DRAFT INTERNATIONAL STANDARD
ISO/DIS 12625-16
ISO/TC 6/SC 2 Secretariat: SIS
Voting begins on: Voting terminates on:
2013-08-29 2014-01-29
Tissue paper and tissue products —
Part 16:
Determination of optical properties — Opacity (paper
backing) — Diffuse reflectance method
Papier tissue et produits tissues —
Partie 16: Détermination des propriétés optiques — Opacité sur fond papier — Méthode par réflexion en
lumière diffuse
ICS: 85.060
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the European Committee for Standardization
(CEN), and processed under the CEN lead mode of collaboration as defined in the
Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member
bodies for a parallel five month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments
received, will be submitted to a parallel two-month approval vote in ISO and
THIS DOCUMENT IS A DRAFT CIRCULATED
formal vote in CEN.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
To expedite distribution, this document is circulated as received from the
IN ADDITION TO THEIR EVALUATION AS
committee secretariat. ISO Central Secretariat work of editing and text
BEING ACCEPTABLE FOR INDUSTRIAL,
composition will be undertaken at publication stage.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 12625-16:2013(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2013
---------------------- Page: 3 ----------------------
oSIST prEN ISO 12625-16:2013
ISO/DIS 12625-16:2013(E)
Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as
permitted under the applicable laws of the user’s country, neither this ISO draft nor any extract
from it may be reproduced, stored in a retrieval system or transmitted in any form or by any means,
electronic, photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2013 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 12625-16:2013
ISO/DIS 12625-16
Contents Page
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle. 3
5 Apparatus . 3
5.1 Reflectometer . 3
5.2 Reference standards . 3
5.3 Working standards . 3
5.4 Black cavity . 3
6 Sampling. 4
7 Conditioning . 4
8 Preparation of test pieces. 4
9 Procedure . 4
10 Calculation . 5
11 Test report . 5
Annex A (normative) Spectral characteristics of reflectometers for measuring luminous factor . 6
A.1 Filter colorimeters . 6
A.2 Abridged spectrophotometers . 6
A.3 Data not available for the full wavelength range 360 nm to 780 nm . 6
Annex B (informative) Precision data . 9
B.1 General . 9
B.2 Opacity. 10
Bibliography . 12
© ISO 2013 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 12625-16:2013
ISO/DIS 12625-16
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 12625-16 was prepared by European Committee for Standardisation (CEN) Technical Committee
CEN/TC 172 Pulp, paper and board, in collaboration with Technical Committee ISO/TC 6, Paper, board and
pulps, Subcommittee SC 2, Test methods for quality specifications for paper and board, in accordance with
the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
Part 1: General guidance on terms;
Part 3: Determination of thickness, bulking thickness, apparent bulk density and bulk;
Part 4: Determination of tensile strength, stretch at break and tensile energy absorption;
Part 5: Determination of wet tensile strength;
Part 6: Determination of grammage;
Part 7: Determination of optical properties — Measurement of brightness and colour with D65/10°
(outdoor daylight);
Part 8: Water-absorption time and water-absorption capacity; basket-immersion test method;
Part 9: Determination of ball burst strength;
Part 11: Determination of wet ball burst strength;
Part 12: Determination of tensile strength of perforated lines — Calculation of perforation efficiency;
Part 15: Determination of optical properties — Measurement of brightness and colour with C/2° (indoor
daylight);
Part 16: Determination of optical properties — Opacity (paper backing) — Diffuse reflectance method
iv © ISO 2013 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 12625-16:2013
ISO/DIS 12625-16
Introduction
Optical measurements are affected by the geometry of the instruments used and by the texture of the
material. The design of the instrument to be used according to this part of ISO 12625, and the routine to be
adopted for its calibration is specified in ISO 2469.
The optical properties are related to the visual appearance of the material. Therefore, although optical
properties are intrinsic properties of tissue paper, they are not functional properties.
The opacity value depends on the principle used for its evaluation, and a method should be chosen which
most closely relates to the interpretation to be placed upon the results. The method described in this
International Standard is applicable when it is desired to measure that property of a tissue paper or tissue
product which governs the extent to which one sheet visually obscures printed matter on underlying sheets of
similar tissue paper or tissue product. It should not be confused with methods based on the reduction in a
standard contrast by interposition of the paper opacity (white backing), formerly known as contrast ratio, nor
with the assessment of the amount and condition of light penetrating a sheet (transparency or translucency).
The calculation of opacity requires luminance-factor data obtained by measurement under specified
conditions. The luminance factor depends on the conditions of measurement, and particularly on the spectral
and geometric characteristics of the instrument used for its determination. This International Standard should
therefore be read in conjunction with ISO 2469.
© ISO 2013 – All rights reserved v
---------------------- Page: 7 ----------------------
oSIST prEN ISO 12625-16:2013
---------------------- Page: 8 ----------------------
oSIST prEN ISO 12625-16:2013
DRAFT INTERNATIONAL STANDARD ISO/DIS 12625-16
Tissue paper and tissue products — Part 16: Determination of
optical properties - Opacity (paper backing) - Diffuse
reflectance method
1 Scope
This part of ISO 12625 specifies testing procedures for the instrumental determination of opacity paper
backing of tissue paper and tissue products by diffuse reflectance.
This part of ISO 12625 also gives specific instructions for the preparation of test pieces (single-ply, multi-ply
products), where special precautions may be necessary.
It can be used to determine the opacity of tissue paper and tissue products which contain fluorescent
whitening agents, provided the UV content of the radiation incident on the test piece has been adjusted to
conform to that in the CIE illuminant C using a fluorescent reference standard provided by an ISO/TC 6
authorized laboratory as described in ISO 2470-1.
This International Standard is not applicable to coloured tissue paper and tissue products which incorporate
fluorescent dyes or pigments.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 186, Paper and board — Sampling to determine average quality
ISO 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 2469, Paper, board and pulps — Measurement of diffuse radiance factor
ISO 2470-1:2008, Paper, board and pulps — Measurement of diffuse blue reflectance factor — Part 1: Indoor
daylight conditions (ISO brightness)
ISO 2471, Paper and board — Determination of opacity (paper backing) — Diffuse reflectance method
ISO/FDIS 12625-7, Tissue paper and tissue products — Part 7: Determination of optical properties —
Brightness and colour with D65/10° (outdoor daylight)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
© ISO 2013 – All rights reserved
1
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oSIST prEN ISO 12625-16:2013
ISO/DIS 12625-16
3.1
reflectance factor
R
ration of the radiation reflected by a surface element of a body in the direction delimited by a given cone with
its apex at the surface element to that reflected by the perfect reflecting diffuser under the same conditions of
irradiation
NOTE 1 to entry [Source ISO 2471:2008].
NOTE 2 to entry The ratio is often expressed as a percentage.
NOTE 3 to entry The reflectance factor is influenced by the backing if the body is translucent.
3.2
luminance factor (C)
luminous reflectance factor
Y(C/2°)-value
R
y
reflectance factor or radiance factor defined with reference to the CIE illuminant C and the visual efficiency
function (λ)
NOTE 1 to entry The visual efficiency function describes the sensitivity of the eye to light, so that the luminance factor
(C) corresponds to the attribute of visual perception of the reflecting surface
...
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